#include "../Eigen/Sparse"

using namespace Eigen;

#ifdef EIGEN_SHOULD_FAIL_TO_BUILD
void
call_ref(Ref<SparseMatrix<float>> a)
{
}
#else
void
call_ref(const Ref<const SparseMatrix<float>>& a)
{
}
#endif

int
main()
{
	SparseMatrix<float> a(10, 10);
	call_ref(a + a);
}
